Safety mechanism for elevator doors



Sept. 4, 1923. 1,467.24?

A. J. JARNIG SAFETY MECHANISM FOR ELEVATOR DOORS Filed March 28. 1921 2Sheets-Sheet 1 gM-Uemtofa @fr drew J Jaw/wy? Sept. 4, 1923. 1,467,247

A. J. JARNIG SAFETY MECHANISM FOR LEVATOR DOORS Filed March 28. 1921 2SheeLs--SheelI 2 Patented Sept... l, 1923.

parte sraras amara saresti arrasa;

ANDREW JARNIG, 0F SEATTLE, WASHINGTON'.

1' SAFETY MECHNISM FOR' ELEVATOR DOORS.

ppllcation led March 2S, 1921. Serial N0. 456,376.

and useful Improvement in Saietyll/lec'ha-y nism forElevator Doors, ofwhich the following is a specification.

My invention relates to improvements in apparatus for opening andclosing rolling or sliding gates or doors andthe object of mylmprovement is to provide apparatus of this nature that may be installedon a. paissenger or freight elevator'of the type commonly used inbuildings and .on the gates or doors of an elevator shaft and that maybe operated in suchla manner as to open and close the doorsor gates ofthe elevator cage and the doors or simultaneously.

Another object is to provide apparatus of this nature that isconstructed in such a manner 'as to make it impossible to open or closethe door or'gate of the elevator shaft unless the elevator cage isstopped in substantially the correct position with respect to the doorof the shaft.

A further object isto provide gate and door opening and closingIapparatus that will make it impossible'to Vmove the cage except whenthe gate or door of such cage and the corresponding gate or door oftheelevator shaft are completely and entirely closedt A further object isto provide elevator gate and door operating means that are electricallyIactuated thereby relieving the elevator operator' of the actual work ofopening and closing the doors or gates.

A further object is to provide automatic' switch mechanism that willopen an electric circuit and cut off the power to the electric dooroperating mechanism the instant the' elevator doors reach afully open oran' entirely closed position.

A still further object is to provide apfparatus of this nature that isstrong and simple in construction, reliable and' efficient in o ration,not. expensive to manufact-ure an that may be readily 'installed onelevator systems of the type now in common use.

With the above and other objects in view as will be |apparent from thefollowing descriptin the invention consists in the novel gates of theelevator shaft construction, ladaptation and combination .of parts ofelevator door operating mechanism as will be-more clearly hereinafterdescribed and claimed.

ln the accompanying drawings, Figure 1 is a View in vertical crosssection of an elevator cage uponV which gate or door closing mechanismconstructed in .accordance with this invention is installed, parts ofthe elevator cage being broken away and the gate or door closingmechanism being shown in elevation. Fig. 2 is a fragmentary View inelevation showing gates or doonsl of the form commonly used for closingthe doorways through which admittance is had to an elevator shaft. Fig.3 is a view partly in plan and partly in cross section showing anoperative position of the elevator cage and gate or door operatingmechanism with respect to the gates or doors of the elevator shaft. Fig.4 is aview in elevation showing certain parts of the gate oI- doorclosing mechanism. Fig. 5 is a. vieW in cross section substantially .ona broken line 5, 5 of Fig. 4. Fig. 6 is a view with the oover'plateremoved of a. lock that is used' for locking the doors of the elevatorshaft in a closed position. Fig. 7 is a. view in elevation showingcertain power transmission devicesV by which an electric motor isconnected with the door 'and gate operating mechanism.

Fig. 8 isa wiring diagram showing the4 electrical connection with theelevator cage and with the motor that operates the devices that are usedfor opening vand closing vthe gates or doors.

Fig. 9 is a fragmentary vlew 1n elevation showing a modified form'ofdoor latch for the doors of the elevator shaft and Fig. 10 1s a planView of the same.

Like reference numerals designate hke partsthroughout the several views.

Referring to the drawings I have shown anelevator cage 10 of theusualform of construction thatmay be provided with a gate formed cfaplurality of vertical bars 11 connected in well-known manner by link.

members 12 and hung uponl rollers 13 that roll within a channel-shapedtrackway' 141%V in such a manner that they may be moved to open or closethe doorway in the front ofv the elevator cage. v

The elevator cage 10 is arranged tobe moved vertically within anelevator shaft having doorways 15 that are opened and sol closed byrolling or sliding doors or gates 16 and 1 7.

The doors 16 and 17 may be of the usual well-known form of constructionand may be supported by hangers 18 that are connected with head blocks19 that roll with a trackway 20 and are preferably provided with theusual mechanism, not shown, for causing the door 17 to move more slowlythan the door 16 so that the two doors will reach the full open or thefull closed position at they` same time. The doorway 15 may also beprovided with a fixed panel channel 21 which has substantially the sameexternal appearance as a door.

All of the parts hereinbefore described may be of the usual standardform of construction.

This invention comprises electrically operated mechanism for opening andclosing the doors of the elevator cage and mechanical devices forengaging with and opening or closing the doors of the elevator shaftsimultaneously with the opening or closing of the doors of the elevatorcage.

The mechanism for opening and closing the door of the elevator cagecomprises a carrier block 22 having a base 23 that is slidably disposedwithin asuitable guideway in a track member 24 that is -secured to aplate 25 that extends crosswise of the eleva-tor cage 10 adjacent thefront edge thereof, see Fig. 3.

26 is a screw that extends lengthwise of the track member 24 and isthreaded through the block 22 in such a manner that when it is rotatedthe block 22 will be moved lengthwise thereon, the thread of the screw26 beingI relatively steep in pitchy so that the block 22 will travel ata fairly rapid speed in proportion to the speed of rotation of thescrew. l

The inner end of the screw 26 is journaled in the bearing 27 and isprovided on one side of such bearing with a thrust collar 28 and on theother side with a pinion 29 that meshes with a gear wheel 30 on theshaft 31 of a motor 32. The gear wheel 30 is preferably loose on themotor shaft 31 and is provided on its rear side with stop members 33that are arranged to be engaged by an arm 34 that is securely keyed tothe motor shaft 31, the arrangement being such that when the motor shaft31 is rotated the gear wheel 3() will be rotated therewith and when thedirection of rotation of the motori shaft 31 is reversed such shaft willturn through substantially one-half of a complete revolution be fore thearm 34 engages with the stop members 33 and begins to turn the gearwheel 30, thus reducing the starting strain on the motor 32 andpermitting the same to pick up speed before the load is applied.

The block 22 has a vertically arranged channel member 35 rigidly securedto the outer side thereof and projecting downwardmezza? ly therefrom asshown in Figs. 4 and 5 and the lowerend of the channel member 35 isrigidly connect/ed by a bracket 36 with the bar 11 at the forward edgeof the gate or door of the elevator cage. The side flanges of thechannel member 35 are preferably curved outwardly at both ends as shownat 39.

The door 16 of the elevator shaft is provided in its upper corner andadjacent its forward edge with a latch mechanism that is disposed withina housing 37 and that comprises a vertically movable bolt 38 that isarranged to be engaged and held by a hook 40 that is yieldingly mountedWithin a casing 41 that is secured to the wall or frame of the elevatorshaft.

` The upper end of the bolt 38 is inclined as at 42 and is arranged tobe engaged by a similarly inclined surface 43 on the end of the hook 40so that as the door 16 is closed the hook 40 will be raised byengagement of the inclined surfaces 42 and 43 and #the bolt 38 will snapinto engagement with the hook.

The bolt 38 is urged upwardly by a compression spring 44 and such boltis provided on one side with rack teeth. 45 that mesh with gear teeth 46on an arm 47 that is mounted on a pivot 48 and is provided with asegment 50 that meshes with a corresponding segment 51 on a lever arm 52that is mounted on a pivot 53.

The upper end of the lever arm 52 is provided with-'a lug 54 thatprojects outwardly through an opening 55 in the cover plate of the lockhousing 37 so that the lever arm may be moved in the direction indicatedby the arrow in Fig. 6 to thereby withdraw the bolt 38 lfrom engagementwith the hook member 40.

The lock housing 37 is provided with a rigid stud 56 that projectsoutwardly through the opening 55 in the cover plate and that serves as astop for the lug 54 and as a means by which the door 16 may be moved ashereinafter explained.

The edge of the vframe against which the door`16 of the elevator shaftstrikes is preferably provided with resilient shock absorbing members57. Similar members may also be provided on the elevator cage to absorbthe shock due to the opening and closing of the door of such cage.

The motor 32 is connected by circuit wires 60 and 61 with a reversingswitch 62 of any standard form of construction which reversing switchmay be connected with circuit wires A63 and 64 through which electricalcurrent may be supplied. The reversing switch 62 vis connected by a link65 with an actuating lever 66 that is fulcrulned on a pivotr67 and thatis provided at its upper end with a slot 68 for the reception of a pin 70 on the end of'a bar 71 that extends lengthnew means of pins 72 thatare rigid with the track and bar.

The bar 71 is provided near itsl opposite ends with upwardly projectingarms 7/1 and 75 that are arranged to be engaged by an outwardlyprojecting lug 76 on the side of the block 22 in such a manner that asthe project through slots 73 inthe.

. block 22 approaches either end of the screw 26 the upwardly projectingarm on that end of the `bar 71 will be engaged by the lug 76 and thelever arm 66 will be moved far enough to open the reversing switch 62.

Asgsoon as the switch 62 is opened the suping 37 ply of current to themotor 32 is cut of and \92 further movement of the gates or doors'L isstopped. j

After the reversing switch 62 has been moved into an open position theslot 68 in the end of the lever arm 66 makes it possible. to close thereversing switch in one direction only but will not permit the reversingswitch to be closed in the opposite direction; for instance, if theswitch 62 is opened by the opening of the doors as shown in Fig. 1' thenthe slot 68will permit the lever 66 to be moved to the left to swing thereversing switch into the closed position shown by full lines in Fig. 8thereby rotating the motor 32 in the proper direction to close the doorsbut it will be impossible to throw the switch 62 into 'the positionshown by dotted lines in Fig. 8 and thus bring a strain on the dooropening and closing mechanism.

1n the same manner if the doors are closed it will not be possible toclose the switch 62 except in the proper direction to open the doors.

The reversing switch Ais' preferably arranged so that the lower end ofthe lever armI 66 will always be moved in the direction in which it isdesired to'have the doors move in opening and closing the same.

AThe elevator cagel is provided with thev usual controller 77 by whichthe operator starts and stops the'motor 'that moves the elevatorvertically and for the 'purpose ,of preventing the elevator cage` frombeing moved when the doors are open I' have protvided a switchcomprising terminals 78 that@ are respectively connected with ends vofthe circuit wire 64 and that are arranged to be bridged by .a contactmember 80 on an arm 81 that is mounted on a fulcrum 82 and provided onits inner end with a roller 83 that is adapted to be engaged by aninclined .lug

84.- on the top of block 22. -The arm Slis nor,I

mally urged into the position shown in Fig. 1 by a spring 85 to therebyopen the switch J and break the circuit that leads to the con' troller77 but the inner end of such arm will 'be lifted by the lug 84 when thedoors are closed thereby closing the switch and per- ,ser

77 to operate inthe ber 86 that corresponds to the hook 40 exceptth atit is provided on the end with an enlarged portion 87 that projectstoward the elevator cage and that is provided on its bottom side with aninclined portion 88 that'may be engaged. by an arm 89 on the block 22 insuch manner as to lift the hook and cause it to release a catch membery90 that may be rigidly secured to an elevator door 91 thatcorrespondsfo the previously described door 16.

When the device shown in Figs. 9 and 10 is used the mechanism within thelock housmay be dispensed with and a fixed lug may be provided on thesurface of the door 91 to be engaged by the channel member 35. y

A key hole 37 may be provided in the lock housing `37 for permittingauthorized per'- In operation when the doors of the shaft and the doorsof the cage are closed the lugs 5ft and 56 will be in such a positionthat the channel 35 will pass freely over such lugs asthe elevator cagemoves up and down.

1f the cage stops infront of a doorway in the shaft th'elugs 54 and 56on that doorway will be within the channel 35 so that if the circuit tothe motor 26 is closed move' to start the cage when the doors are open*so that the lugs 54 andv 56 must remain within the channel member 35 andbe closed sin'iultaneously with lthe closing of the door of i theelevator cage.

From the foregoing-description taker-1in `connection withtheaccompanying drawings the advantages of the construction and methodof operation 'of this elevator door operating-device willv be readilyapparentf but,- while I have described the principle of operation oftheinvention together with the device which I no W consider to be the'bestembodiment thereof, I desire to have it understood that the device shownis merely illustrative vand Athat such changes may ne resorted to as arewithinthe scope of the following` claims.

What I claim is:

1. The combination with elevator mechanismincluding a vertical elevatorshaft having doorways provided with horizont-ally movable doors, and avertically movable elevator cage having a doorway provided with lockingthe doors'of said shaft in a lclosed position, said means comprising ahousing mounted in each of said shaft doors, a casing secured to theframe of the said elevator sha-ft, a hook member yieldably mountedwithin the said casing, a bolt slidably mounted within the said housingand eX- tending therefrom for engaging the said `hook member, and meanswithin the said housing for moving said bolt member out of engagementwith the said hook member, said last mentioned means comprising racksprovided on one side of said bolt member, an arm pivotally mounted toone wall of the said housing, gear teeth provided on ,one `end of saidarm for meshing with said rack teeth, a segment provided at t-he otherend of said arm, a lever member pivotally mounted to the said housingwall, a segment pro-l vided at one end of the said lever member andmeshing with the segment on the said arm, said lever member and said armmember being provided for moving the said bolt member vertically whenthe lever member is swung horizontally.

2. The combination with elevator mechanism including a vertical elevatorshaft having doorways provided with horizontally movable doors,`and avertically movable elevator cage having a doorway provided withhorizontally movable doors, of apparatus for opening and closing thedoors of said cage and the doors of said shaft simultaneously, anelectric motor for driving said apparatus, and automatic means forbreaking the circuit to said mot-or at the instant said doors are in afully open or fully closed position, said means comprising a reversingswitch, a bar slidably mounted on the said cage, 4a lever arm pivotallymounted to said cage, said lever'arm operatively connecting saidreversing 'switch with said slidably mounted bar and means foroperatively connecting said door opening apparat-us with said slidablymounted bar for throwing the said reversing switch into its openposition.

3. The combination with elevator mechanism including a vertical elevatorshaft having doorways provided with horizontally movable doors, avertically movable elevator cage having a 4doorway provided with ahorizontally movable door, of means for opening and 'closing said doorssimultaneously,v said means comprising a screw eX- tending crosswise ofthe top portion of said cage, a motor for rotating said screw, a carrierblock threaded on said screw and movable lengthwise thereof byfrotationof said screw, and means for connecting said carrier block with saiddoors, automatic means for breaking the circuit to sald motor at theinstant said doors are in their fully open or fully closed position,said means comprising a reversing switch, a bar slidably mounted on saidcage, a lever arm pivotally mounted in said cage, said lever armoperatively connecting said reversing switch with said slidably mountedbar,4 and means for operatively connecting said carrier block with saidslidably mounted bar for throwing'the said reversing switch into itsopen position.

4. The combination with elevator mechanism including a vertical elevatorshaft having doorways provided with horizontally movable doors and avertically movable elevator cage having a doorway provided with ahorizontally movable door, of means for opening and closing said doorssimultaneously, said means comprising a screw extending crosswise of thetop portion of said cage, a motor for rotating said screw, a carrierblock threaded on said screw, and movable lengthwise thereof by rotationof saidscrew, and means for connecting said carrier blocks with saiddoors, automatic means for breaking the circuit to said motor at theinstant said doors are in a fully open or fully closed position, saidmeans comprising a reversing switch, a bar slidably mounted on saidcage, a lever arm pivotally mounted to said cage, said lever armoperatively connecting said reversin switch with said slidably mountedbar, an means for operatively connecting said carrier blocks with saidslidably mounted bar for throwing the said reversing switch into itsopen position, said last named means comprising upwardly projecting armscarried by the slidably mounted bar, and a lu secured in said carrierblock and adapted to engage said projecting arms. y

5. The combination with elevator mechanism including a vertical elevatorshaft having doorways provided with horizontally movable doors, and avertically movable elevating cage having a doorway provided with ahorizontally movable door, of means for opening and closing said doorssimultaneously, saidv means comprising a screw extending crosswise ofthe top portion of said cage, an electric motor for rotating said screw,a carrier block threaded on said screw and movable lengthwise thereof byrotation of said screw, and means for connecting said carrier blockswith said doors, a reversing switch interposed in the circuit wires ofsaid electric motor, and means for limiting the movement of saidreversing switch to the direction necessaryafor closing the propercircuit to cause the electric motor to rotate in the opposite directionto its last direction of rotation, said last mentioned means comprisinga bar slidably mounted on said cage, said barhaving longitudinallyextending slots formed therein, laterally projecting pins carried bysaid cage andfadapted to engage said slot-forV limiting the movement ofsaid. bar, a. lever arm' pivotally mounted in said cage, said lever armhaving a transverse slot formed in its upper end that is adapted forengag- 5 ing' a, pin carried by said bar to limit'the movement of saidlever to the direction opposite to its ast direction of movement anda`connection between said lever :and said reverslng swltch.

1n Witness whereof., I herento lsubscribe 10 my name' this 21st dayv of,March, A. D. 1921. l 1 A I ANDREW JARNIGI

